DE102014222208A1 - Hybrid drive device - Google Patents

Abstract

Method for operating a hybrid drive device for a hybrid vehicle (1), the hybrid drive device comprising an internal combustion engine-generator unit (6) as a range extender, at least one electric machine (3) for driving and decelerating the hybrid vehicle (1) and a battery (4) comprising the steps of: generating mechanical energy in an internal combustion engine of the internal combustion engine generator unit (6), converting the mechanical energy into electrical energy in a generator of the internal combustion engine generator unit (6), charging the battery (4) and / or Operating the at least one electric machine (3) as an electric motor with electrical energy from the generator (8), operating the internal combustion engine generator unit (6) in dependence on the state of charge (SOC) of the battery (4), so that from an increase in the State of charge (SOC) of the battery (4) above an upper threshold value (So) of the state of charge (SOC) of the battery (4), the internal combustion engine generator Ei beauty (6) is turned off and from a decrease in the state of charge (SOC) of the battery (4) below a lower threshold (Su) of the state of charge (SOC) of the battery (4), the engine-generator unit (6) is turned on, the upper threshold value (So) and / or the lower threshold value (Su) are changed in dependence on the path properties of a drive with the hybrid vehicle (1), so that the engine-generator unit (6) according to the changed upper threshold value (So) and / or lower threshold (Su) is turned off and / or turned on.

Description

The present invention relates to a method for operating a hybrid drive device according to the preamble of claim 1 and a hybrid drive device according to the preamble of claim 14.

State of the art

Increasingly, motor vehicles are being developed and / or manufactured by the automotive industry, which are driven by an electric machine. In this case, the electrical energy for the operation of the electric machine for driving the hybrid vehicle comes from a arranged in the hybrid vehicle battery. The battery is charged during standstill of the hybrid vehicle to a power grid.

The electric vehicle includes a charger for this purpose. The capacity for storing electrical energy of the battery is limited, so that only ranges with electrical energy from the battery in the range of about 50 km to 200 km can be achieved by the hybrid vehicle. To increase the range of the hybrid vehicle this is provided with a so-called range extender, an internal combustion engine generator unit. This form of range extender also corresponds to a serial plug-in hybrid. However, embodiments are also conceivable in which an additional switchable mechanical coupling between the engine and the drive wheels. This electric vehicle with additional combustion engine-generator unit is referred to as a hybrid vehicle. For longer journeys with the hybrid vehicle, during which the battery can not or can not be sufficiently charged from a mains supply, the battery is charged by means of the internal combustion engine-generator unit and / or electric current is supplied to the electric machine by means of the internal combustion engine-generator unit. Thereby, the possible range of such a hybrid vehicle with a range extender can be increased to ranges that corresponds to that of conventional motor vehicles, which are driven exclusively by an internal combustion engine.

The electric machine of the motor vehicle is operated both as an electric motor and as a generator. When operating as an electric motor, the electric machine is used to drive the motor vehicle, and when the electric machine is operated as a generator in recuperation operation, the electric machine serves to decelerate the motor vehicle or hybrid vehicle. If operation of the internal combustion engine-generator unit is required during the travel of the hybrid vehicle, the electric machine operated as electric motor and / or the battery is charged with the electrical energy provided by the internal combustion engine-generator unit.

The internal combustion engine-generator unit is operated depending on the state of charge of the battery. As the state of charge of the battery drops below a lower threshold during travel of the hybrid vehicle, the engine-generator unit is turned on to charge the battery, i. H. to prevent complete discharge of the battery. As the state of charge of the battery during the travel of the hybrid vehicle increases above an upper threshold value, the internal combustion engine-generator unit is switched off in order to avoid a complete charging of the battery with the internal combustion engine-generator unit.

When driving or operating the hybrid vehicle in city traffic or on rural roads, a small first average power is needed to drive the hybrid vehicle from the at least one electric motor. Driving on high speed highways requires a large second average power from the at least one electric motor. If the state of charge of the battery drops below the lower threshold value during the driving in city traffic during a future and upcoming trip on the motorway, the internal combustion engine-generator unit is switched on. However, this is disadvantageous because while driving in city traffic low noise, z. B. from wind and rolling noise of the tires, occur and thereby the operation of the internal combustion engine-generator unit is perceived subjectively more acoustically.

During travel in city traffic, only a small average electrical power is required by the at least one electric motor, so that much of the electrical energy provided by the engine-generator unit can be used to charge the battery and charge the battery quickly so that the engine-generator unit can be operated disadvantageously only for a short time. The charge of the battery for charging electric charging power is small and while driving in city traffic requires at least one electric motor only a small electrical power, so that the engine-generator unit only briefly with a small power than the sum of the charging power of the battery and The performance of the electric machine can be operated with a lower efficiency of the internal combustion engine-generator unit.

While driving on the highway and a subsequent ride in city traffic, the battery is charged only up to the constant upper threshold, so that in the subsequent ride in city traffic, the state of charge of the battery is insufficient to the hybrid vehicle in city traffic to the destination exclusively or predominantly with the electrical energy from the battery to move to the destination. Disadvantageously, therefore, the combustion engine-generator unit must be turned on in city traffic with a low efficiency and a greater subjectively perceptible noise nuisance.

The DE 10 2008 039 907 shows a vehicle with a power source, an electrical energy storage, a generator for generating electrical energy and for charging the electric energy storage generator, an electric traction motor and a trained for switching on and / or turning off the power source activating device, wherein by a starting device with a control which initiates the switching on and / or off of the power source by the activation device, wherein the control element is designed such that it allows the initiation without the need for the driver to be in the vehicle at the time of initiation.

Disclosure of the invention

Advantages of the invention

Method according to the invention for operating a hybrid drive device for a hybrid vehicle, the hybrid drive device comprising a combustion engine-generator unit as a range extender, at least one electric machine for driving and decelerating the hybrid vehicle and a battery comprising the steps of: generating mechanical energy in an internal combustion engine of the internal combustion engine Generator unit, converting the mechanical energy into electrical energy in a generator of the internal combustion engine-generator unit, charging the battery and / or operating the at least one electric machine as an electric motor with electrical energy from the generator, operating the internal combustion engine generator unit in dependence from the state of charge of the battery, so that from an increase in the state of charge of the battery above an upper threshold of the state of charge of the battery, the engine-generator unit is switched off and from a decrease in Ladezus the battery below a lower threshold of the state of charge of the battery, the engine-generator unit is turned on, wherein the upper threshold and / or the lower threshold depending on the route properties of a ride on the hybrid vehicle are changed, so that the internal combustion engine generator Unit is turned off and / or turned on according to the changed upper threshold and / or lower threshold. The upper and / or lower threshold value is changed by a computing unit as a function of the path properties. The upper and / or lower threshold can thus be optimized so that the subjectively perceptible noise of the engine of the internal combustion engine-generator unit is small and the engine-generator unit operates with a high efficiency. As a result, on the one hand the efficiency of the hybrid vehicle can advantageously be increased and, on the other hand, the subjectively perceptible noise development of the internal combustion engine of the internal combustion engine-generator unit can be reduced.

In an additional embodiment, the upper threshold and / or the lower threshold of the battery are varied by more than 10%, 20%, 30% or 50% depending on the path characteristics and / or the upper threshold is greater than the lower threshold. By a correspondingly large change in the upper and / or lower threshold value, a significant improvement of the energy optimization and the subjectively perceptible noise development of the internal combustion engine can be achieved. The difference between the upper and lower thresholds is preferably greater than 2%, 15%, 20%, 30%, 40% or 50%.

In a further refinement, the past and / or future route properties are used as route properties.

In an additional embodiment, in past lane characteristics with a first average power to drive the hybrid vehicle and future lane characteristics with a second average power to drive the hybrid vehicle, where the first average power is less than the second average power, the lower threshold is decreased and preferably becomes also the upper threshold is reduced. The past route characteristics are at a time of driving the entire route characteristics of the past or even just a part of the past route characteristics of the past since the start or the start of the journey. The future route characteristics in a trip are the route characteristics in the entire future, that is, to the end of the trip or part of the future route characteristics before the end of the trip. When driving in city traffic or on a country road becomes the Drive the hybrid vehicle needs a small average power. When traveling on the highway at a high speed, a large average power is needed to drive the hybrid vehicle. If the hybrid vehicle is currently driving on a highway or in city traffic and the hybrid vehicle is going to travel on a highway in the future, it makes sense to reduce the lower threshold. As a result, the charge state of the battery continues to drop while driving in city traffic, and the engine-generator unit is only switched on while driving on the highway. While driving on the highway, the engine-generator unit is operated at a higher speed and a large electric power because the electric machine requires a large electric power. As a result, the internal combustion engine-generator unit can also be operated with a greater or optimized efficiency. In addition, while driving on the highway, the noise of the internal combustion engine is subjectively less perceived due to the larger background noise, for example, wind or tire rolling noise.

In an additional embodiment, at past mileage characteristics with a first average power to drive the hybrid vehicle and future mileage characteristics with a second average power to drive the hybrid vehicle, where the first average power is greater than the second average power, the upper threshold is increased and preferably also the lower threshold increases. With the current ride on a highway and a subsequent ride in the future in city traffic, the upper threshold is increased. While driving on the highway thus the state of charge of the battery is further increased. As a result, the charging of the battery or the operation of the internal combustion engine-generator unit at a higher speed on the highway can be exploited for charging the battery and there is less subjectively perceptible noise development. With this larger state of charge of the battery then a larger part or the entire route can be operated to the destination of driving in city traffic with electrical energy from the battery.

In a supplemental embodiment, the first average power and the second average power differ by more than 10%, 20%, 30% or 50% and / or the power for driving the hybrid vehicle, in particular exclusively, is from the at least one electric machine as the electric motor made available.

In an additional embodiment, in a time end region of the journey in front of the target of the hybrid vehicle, the threshold value is reduced and preferably the upper threshold value is reduced, preferably the end time range is less than 30%, 20%, 10% or 5% of the total travel time of the journey. Shortly before the end or destination of the journey, the lower threshold value is thus reduced, thereby further lowering the state of charge of the battery. As a result, after reaching the destination of the drive, the battery can be charged to a public power grid to a greater extent. Charging the battery on the public grid is generally cheaper, more environmentally friendly, and more energy efficient than charging the battery with the engine-generator unit.

Suitably, during a state of charge of the battery between the upper and lower threshold, the engine-generator unit is turned on or off.

In a supplementary variant, during a state of charge of the battery which is greater than the upper threshold value, the internal combustion engine generator unit is always switched off and / or during a state of charge of the battery which is smaller than the lower threshold value, the internal combustion engine generator unit is always on and / or during a powered-up engine-generator unit, the battery is charged.

In an additional embodiment, the internal combustion engine-generator unit is initially switched off and the state of charge of the battery is greater than the upper threshold and at a later decrease in the state of charge of the battery, the engine-generator unit is only turned on when the state of charge Battery is less than the lower threshold.

In a further variant, the internal combustion engine-generator unit is initially switched on over time and the state of charge of the battery is less than the lower threshold and at a later increase in the state of charge of the battery, the engine-generator unit is turned off when the state of charge Battery is greater than the upper threshold.

In an additional embodiment, the route properties are provided by a navigation system, and preferably the second average power for the hybrid vehicle is calculated by means of an arithmetic unit from the future route properties, and preferably with the arithmetic unit the first average power from the past Route properties and / or calculated from the course of actual past performance. The driver of the hybrid vehicle enters the destination or the destination position before starting the journey into the navigation system. The initial position is known to the navigation system from the GPS data of the hybrid vehicle. The route properties, for example the speed, altitude and / or curvature information of the route, are stored in a memory unit of the navigation system. Furthermore, the driving behavior of the past with the hybrid vehicle is stored in the navigation system and this driving behavior is evaluated by the computing unit, so that conclusions can be drawn about the future driving behavior. If, for example, the driver of the hybrid vehicle drives the same route from home to work on Mondays to Fridays, this is detected by the arithmetic unit so that the driving behavior of the future and thus also the route characteristics are known to the navigation system for operating the method. In a calculation of the first average power from the history of the actual power of the past, the calculation also depends on the track characteristics, because the course of the actual power of the past also depends on the track characteristics.

In a supplementary embodiment, the navigation system determines the route properties from the starting position and destination position of a journey with the hybrid vehicle and / or from the driving behavior of the past with the hybrid vehicle.

In a further embodiment, the internal combustion engine is operated as a function of the speed of the hybrid vehicle, and the speed of rotation of the internal combustion engine increases as the speed of the hybrid vehicle increases, and vice versa. Subjectively, the noises generated by the internal combustion engine are only perceived to be low, because with larger noises due to wind or rolling noise because of a high speed of the hybrid vehicle, large noises of the internal combustion engine are subjectively barely perceived.

Preferably, the electric power of the engine-generator unit is less than one-third or two-thirds of the electric power of the at least one electric machine or the sum of the electric power of the electric machines of the hybrid vehicle.

Hybrid drive device according to the invention, comprising at least one electric machine for driving and decelerating the hybrid vehicle, a battery, an internal combustion engine generator unit as a range extender for charging the battery and / or for generating electrical energy for the at least one electric machine, one in this patent application described method is executable.

In an additional embodiment, the internal combustion engine of the internal combustion engine-generator unit has no mechanical connection to the wheels of the hybrid vehicle as a serial hybrid vehicle. Suitably, the internal combustion engine of the internal combustion engine-generator unit has a mechanical connection to the wheels of the hybrid vehicle as a parallel hybrid vehicle.

In an additional embodiment, the hybrid propulsion device or hybrid vehicle is provided with means, e.g. B. a charger and / or a power cable and / or a plug, for charging the battery from a, preferably public, power supply provided.

In one variant, the generator is a, preferably permanent magnet excited, synchronous electric machine.

Computer program according to the invention with program code means which are stored on a computer-readable data medium to perform a method described in this patent application when the computer program is executed on a computer or a corresponding computing unit or a control unit.

Computer program product according to the invention with program code means which are stored on a computer-readable data carrier to carry out a method described in this patent application when the computer program is executed on a computer or a corresponding computing unit or a control unit.

A hybrid vehicle according to the invention comprises a hybrid drive device described in this patent application and / or a method described in this patent application is executable by the hybrid vehicle according to the invention. The hybrid vehicle is preferably driven exclusively by the electric machine and preferably there is no mechanical connection between the internal combustion engine of the range extender and at least one wheel of the hybrid vehicle, i. H. the internal combustion engine is preferably used exclusively for generating electrical energy.

Brief description of the drawings

In the following, an embodiment of the invention will be described in more detail with reference to the accompanying drawings. It shows:

1 a schematized system image of an internal combustion engine-generator unit as a range extender,

2 a schematized system image of a hybrid drive device,

3 a view of a hybrid vehicle,

4 the course of the state of charge of a battery of the hybrid drive device plotted on the ordinate as a function of time plotted on the abscissa and

5 a flowchart of the method steps of a running of the hybrid drive device method.

Embodiments of the invention

In hybrid vehicles 1 as motor vehicles 2 that by an electric machine 3 by means of electrical energy from a battery 4 operated, is to extend the range of the hybrid vehicle 1 an internal combustion engine generator unit 6 used. By means of the internal combustion engine generator unit 6 as a so-called range extender is fuel from a fuel tank 5 that by a fuel line 16 is conducted, mechanical energy from an internal combustion engine 7 generated by a generator 8th as a permanent magnet synchronous machine 9 is converted into electrical energy. The internal combustion engine 7 is with the generator 8th by means of a drive shaft 15 mechanically connected ( 1 ). The generator 8th generates alternating current from a rectifier 11 is converted into direct current. By means of electrical energy from the generator 8th either the battery 4 charged and / or the electric machine 3 operated as an electric motor. This can reduce the range of the hybrid vehicle 1 essential, z. To ranges in the range of about 300 km to 600 km. The range of the hybrid vehicle 1 by means of electrical energy from the battery 4 is for example in the range of 50 km to 150 km. A hybrid drive device 12 includes the internal combustion engine generator unit 6 , the electric machine 3 and the battery 4 , The generator 8th as a synchronous machine 9 , the rectifier 11 and the battery 4 are here by means of power lines 17 connected with each other.

In 3 is the hybrid vehicle 1 dargstellt. The hybrid vehicle 1 is exclusively from the electric machine 3 driven. The electrical energy to drive the hybrid vehicle 1 comes from the battery 4 and / or the internal combustion engine-generator unit 6 , To the range of the hybrid vehicle 1 increase is in the hybrid vehicle 1 the internal combustion engine generator unit 6 according to 1 built-in. This can reduce the range of the hybrid vehicle 2 be extended. By means of the generator 8th provided electric power can either be the battery 4 be charged and / or the electric machine 3 for driving or traction of the hybrid vehicle 1 operate.

The electric machine 3 to drive the hybrid vehicle 1 can also be used in recuperation mode as a generator for deceleration or braking of the hybrid vehicle 1 be used. The electric machine 3 is thus operated both as an electric motor and as a generator. In recuperation, the electric machine brings 3 a recuperation torque as negative torque to the hybrid vehicle 1 on, so that thereby the hybrid vehicle 1 is slowed down. By means of this Rekuperationsdrehmomentes the electric machine 3 powered and generates electrical current to charge the battery 4 , Preferably, the battery is 4 a high-voltage battery, for example, with a voltage of more than 50 or 100 volts. During a standstill or parking the hybrid vehicle 1 This can be done by means of an external or internal charger, not shown by an external power grid 18 , z. B. a 230 volt home network, to be charged. In the hybrid vehicle 1 There is no direct mechanical connection from the internal combustion engine 7 to a wheel 14 or a drive train of the hybrid vehicle 1 , The serial hybrid vehicle 1 is thus exclusively of mechanical energy of the electric machine 3 driven.

The of the internal combustion engine generator unit 6 available maximum electrical power is much smaller than the electric or mechanical power of the electric machine 3 , For example, that of the engine-generator unit 6 maximum available electrical power less than two thirds or one third of the maximum electrical or mechanical power of the electric machine 3 ,

In a normal ride with the hybrid vehicle 1 for driving at moderate speed, for example, at 90 or 100 km / h, ranges from the engine-generator unit 6 provided electric power to this speed of the hybrid vehicle 1 with the electric machine 3 maintain against the existing driving resistance. However, should briefly a strong acceleration with the hybrid vehicle 1 done, for example, during one Overtaking, is a much higher mechanical drive power through the electric machine 3 to provide.

This required high electrical power can from the engine-generator unit 6 due to its low electric power can not be provided, so during such acceleration operations or short-term driving conditions with an increased required electric power for the electric machine 3 electrical energy from the battery 4 can be removed to thereby temporarily occurring high required electrical power to the electric machine 3 while driving. As a result, even with a slightly charged battery 4 Also required electrical power peaks while driving from the electric machine 3 be provided because higher electrical power of the electric machine 3 sometimes with electrical energy from the battery 4 can be provided. Thus, even with a very slightly charged battery 4 on the one hand, high ranges with the hybrid vehicle 1 achievable and still can briefly high electrical power or mechanical drive power with the electric machine 3 be provided to drive the hybrid vehicle 1 ,

The internal combustion engine generator unit 6 is from the arithmetic unit 13 or control unit 13 depending on the state of charge SOC of the battery 4 controlled and / or regulated, that is switched on or off. Is the state of charge SOC of the battery 4 greater than an upper threshold S _o , the internal combustion engine generator unit 6 switched off and is the state of charge SOC of the battery 4 smaller than a lower threshold S _{u of} the state of charge SOC of the battery 4 , becomes the internal combustion engine generator unit 6 switched on and thus the battery 4 charged. As a result, on the one hand, an excessive drop in the state of charge of the battery 4 be avoided, even with the electric machine 3 greater electrical power to drive the hybrid vehicle 1 to make available. In addition, this also affects the range of the hybrid vehicle 1 extended. Due to the upper threshold S _o is too much charging of the battery while driving with the engine-generator unit 6 avoided charging the battery 4 on the public power grid 18 is more economical.

In 4 is in a Cartesian coordinate system on the abscissa the time t plotted as the travel time t and the ordinate the state of charge SOC of the battery 4 in percent (%). At the beginning of the journey with the hybrid vehicle 1 is the battery 4 fully charged, that is, the state of charge SOC of the battery 4 is 100%. In the initial phase of the journey with the hybrid vehicle 1 becomes the electric machine 3 as an electric motor exclusively by means of electrical energy from the battery 4 operated, thereby the state of charge SOC of the battery 4 decreases until the lower threshold S _u , z. B. after 100 km driving distance is reached. Upon reaching the lower threshold S _u , the engine-generator unit 6 started and thereby the state of charge SOC of the battery 4 increases until the upper threshold S _{o is} reached. In the period from reaching the lower threshold S _u to the upper threshold S _o is the engine-generator unit 6 switched on. In the diagram in 4 is specified with "off" that the internal combustion engine generator unit 6 is turned off and with "on" is indicated that the internal combustion engine generator unit 6 is turned on. Upon reaching the upper threshold S _o , the engine-generator unit 6 switched off and only switched on again when the lower threshold S _{u is} reached. The state of charge SOC of the battery 4 thus varies between the upper threshold S _o and the lower threshold S _u . In this case, the state of charge SOC of the battery 4 also slightly lower than the lower threshold S _u fall, despite the operation of the internal combustion engine-generator unit 6 that of the internal combustion engine generator unit 6 provided electrical power is insufficient to the electric machine 3 to operate as an electric motor, that is to operate the electric machine 3 as an electric motor for driving the hybrid vehicle 1 the electrical energy from both the engine-generator unit 6 comes as well as from the battery 4 ,

In a navigation system 10 are the data of a digital navigation map and in addition the route properties, such as the speed, altitude and / or curvature information of the route stored. The navigation system 10 is therefore not a standard navigation device. The driver of the hybrid vehicle 1 indicates the destination of the ride and the start or start position of the hybrid vehicle 1 are from the GPS system the hybrid vehicle 1 known. The navigation system 10 can thereby the route characteristics of the future drive of the arithmetic unit 13 make available and the arithmetic unit 13 can calculate the required average power of the future trip from the line properties and also divide the trip into individual sections. These sections have an average required power to drive the hybrid vehicle. Furthermore, with the arithmetic unit 13 while driving with the hybrid vehicle 1 a calculation 19 a first average power for driving the hybrid vehicle 1 in the past and a calculation 20 a second average performance of the Future for driving the hybrid vehicle 1 ( 5 ). The first average power affects all or part of the past travel time in the past. The second average power relates to the time course all the time to the destination or a portion of the travel time to the destination. The first average power of the past may be from the arithmetic unit 13 from past route characteristics or from the course of the actual power to drive the electric machine 1 be calculated. The second average power will be the future range characteristics of the hybrid vehicle's travel route 1 from the arithmetic unit 13 due to in the navigation system 10 stored data is calculated. Subsequently, with the arithmetic unit 13 a comparison 21 ( 5 ) of the first and second average power. It is from the arithmetic unit 13 a shrinking 22 the lower threshold value S _{u of} the state of charge SOC of the battery 4 if the first average power is less than the second average power. In addition, it is done by the arithmetic unit 13 an enlargement 23 of the upper threshold S _o if the first average power is greater than the second average power. The shrinking down 22 or zooming in 23 However, the threshold values S _o , S _u only occur if the difference between the first and second average power in the comparison 21 is above a predetermined minimum difference distance, for example 3%, 5%, 10%, 20% or 30% of the maximum electrical power the electric machine 3 , is available.

Drives the hybrid vehicle 1 currently, for example, in city traffic and will become the hybrid vehicle 1 In the future, moving on a highway, the first average power is less than the second future average power. While driving in city traffic is thus by the computing unit 13 the lower threshold S _{u of} the state of charge SOC of the battery 4 reduced, so while driving in city traffic the battery 4 is discharged more. This allows operation of the internal combustion engine-generator unit 6 be avoided while driving in city traffic, thereby increasing a greater perceptible subjective noise due to the operation of the internal combustion engine 7 the internal combustion engine-generator unit 6 can be prevented and further may in a subsequent operation of the internal combustion engine-generator unit 6 while driving the hybrid vehicle 1 on the highway the internal combustion engine generator unit 6 also in a larger speed range of the internal combustion engine 7 be operated with a greater efficiency over a longer period.

While driving on a highway with a large first average past power and a future ride in city traffic with a small second average power in the future, the upper threshold S _{o will increase} . Increasing the upper threshold S _o while driving on the highway causes the battery 4 while driving on the highway is more charged. This allows the ride on the highway to be exploited to the internal combustion engine generator unit 6 operate with a lower subjectively perceptible noise and with greater efficiency. In the subsequent ride in city traffic is thus no operation of the internal combustion engine-generator unit 6 or an operation of the internal combustion engine generator unit 6 required to a lesser extent, because at the entrance of the hybrid vehicle 1 in city traffic the state of charge SOC of the battery 4 is increased due to the larger upper threshold S _o . Furthermore, the lower threshold value S _u is preferably also increased while driving on the highway.

The internal combustion engine generator unit 6 is from the arithmetic unit 13 operated in such a way that a shutdown 24 the internal combustion engine-generator unit 6 is executed if the state of charge SOC of the battery 4 is greater than the upper threshold S _o . Furthermore, a switch-on 25 the internal combustion engine-generator unit 6 if the state of charge SOC of the battery 4 is less than the lower threshold S _u .

Overall, with the method according to the invention and the hybrid drive device according to the invention 12 significant benefits. While driving on a route with track characteristics with a small first average power and an upcoming ride in the future of the hybrid vehicle 1 on a section with a large second average power to drive the hybrid vehicle 1 is the lower threshold S _u and preferably also the upper threshold S _o reduced, thereby the state of charge SOC of the battery 4 is reduced and the charging of the battery is performed to a greater extent optimized in the future. Conversely, during travel on a route with a large first average power and a future drive with a route with a small second average power, the upper threshold S _{o is} increased, and preferably also the lower threshold S _{u is} increased. This allows, during the route, for example, driving on a highway at a great speed, the internal combustion engine generator unit 6 longer with greater efficiency and noise-optimized operation.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008039907 [0009]

Claims (15)

Method for operating a hybrid drive device ( 12 ) for a hybrid vehicle ( 1 ), the hybrid propulsion device ( 12 ) comprising an internal combustion engine generator unit ( 6 ) as a range extender, at least one electric machine ( 3 ) for driving and decelerating the hybrid vehicle ( 1 ) and a battery ( 4 ) comprising the steps of: - generating mechanical energy in an internal combustion engine ( 7 ) of the internal combustion engine-generator unit ( 6 ), - converting the mechanical energy into electrical energy in a generator ( 8th ) of the internal combustion engine-generator unit ( 6 ), - charging the battery ( 4 ) and / or operating the at least one electric machine ( 3 ) as an electric motor with electrical energy from the generator ( 8th ), - operating the internal combustion engine generator unit ( 6 ) as a function of the state of charge (SOC) of the battery ( 4 ), so that from an increase in the state of charge (SOC) of the battery ( 4 ) above an upper threshold (S _o ) of the state of charge (SOC) of the battery ( 4 ) the internal combustion engine generator unit ( 6 ) is switched off and from a decrease in the state of charge (SOC) of the battery ( 4 ) below a lower threshold value (S _u ) of the state of charge (SOC) of the battery ( 4 ) the internal combustion engine generator unit ( 6 ) is switched on, characterized in that the upper threshold value (S _o ) and / or the lower threshold value (S _u ) in dependence on the route characteristics of a journey with the hybrid vehicle ( 1 ), so that the internal combustion engine-generator unit ( 6 ) is turned off and / or turned on according to the changed upper threshold (S _o ) and / or lower threshold (S _u ). Method according to claim 1, characterized in that the upper threshold (S _o ) and / or the lower threshold (S _u ) of the battery ( 4 ) are changed by more than 10%, 20%, 30% or 50% depending on the line properties and / or the upper threshold (S _o ) is greater than the lower threshold (S _u ). A method according to claim 1 or 2, characterized in that the path properties of the past and / or the future track properties are used. Method according to one or more of the preceding claims, characterized in that in the case of past line properties with a first average power for driving the hybrid vehicle ( 1 ) and future line properties with a second average power to drive the hybrid vehicle ( 1 ), wherein the first average power is less than the second average power, the lower threshold (S _u ) is decreased and preferably also the upper threshold (S _o ) is reduced. Method according to one or more of the preceding claims, characterized in that in the case of past line properties with a first average power for driving the hybrid vehicle ( 1 ) and future line properties with a second average power to drive the hybrid vehicle ( 1 ), wherein the first average power is greater than the second average power, the upper threshold (S _o ) is increased, and preferably also the lower threshold (S _u ) is increased. A method according to claim 4 or 5, characterized in that the first average power and the second average power differ by more than 10%, 20%, 30% or 50% and / or the power for driving the hybrid vehicle ( 1 ), in particular exclusively, of the at least one electric machine ( 3 ) is provided as an electric motor. Method according to one or more of the preceding claims, characterized in that in a time end region of the journey in front of the target of the hybrid vehicle ( 1 ) which is reduced below the threshold value (S _u ) and preferably the upper threshold value (S _o ) is reduced, preferably the end time range is less than 30%, 20%, 10% or 5% of the total travel time of the journey. Method according to one or more of the preceding claims, characterized in that during a state of charge (SOC) of the battery ( 3 ) between the upper threshold (S _o ) and lower threshold (S _u ) the internal combustion engine generator unit ( 6 ) is switched on or off. Method according to one or more of the preceding claims, characterized in that during a state of charge of the battery ( 4 ), which is greater than the upper threshold (S _o ), the internal combustion engine generator unit ( 6 ) is always switched off and / or during a state of charge of the battery ( 4 ), which is less than the lower threshold value (S _u ), the internal combustion engine generator unit is always switched on and / or during a switched-on internal combustion engine generator unit ( 6 ) the battery ( 4 ) is loaded. Method according to one or more of the preceding claims, characterized in that over time the internal combustion engine-generator unit ( 6 ) is first off and the state of charge (SOC) of the battery ( 4 ) is greater than the upper threshold (S _o ) and at a later decrease in the state of charge (SOC) of the battery ( 4 ) the internal combustion engine generator unit ( 6 ) is only switched on when the state of charge (SOC) of the battery ( 4 ) is less than the lower threshold (S _u ). Method according to one or more of the preceding claims, characterized in that over time the internal combustion engine-generator unit ( 6 ) is first turned on and the state of charge (SOC) of the battery ( 4 ) is smaller than the lower threshold (S _u ) and at a later increase in the state of charge (SOC) of the battery ( 4 ) the internal combustion engine generator unit ( 6 ) is switched off when the state of charge (SOC) of the battery ( 4 ) is greater than the upper threshold (S _o ). Method according to one or more of the preceding claims, characterized in that the path properties of a navigation system ( 10 ) and preferably with a computing unit ( 13 ) is calculated from the future track properties, the second average power for the hybrid vehicle and preferably with the computing unit ( 13 ) the first average power is calculated from past route characteristics and / or from the history of actual past performance. Method according to claim 12, characterized in that by the navigation system ( 10 ) the track properties from the initial position and target position of a drive with the hybrid vehicle ( 1 ) and / or from the driving behavior of the past with the hybrid vehicle ( 1 ) be determined. Hybrid drive device ( 12 ) for a hybrid vehicle ( 1 ), comprising - at least one electric machine ( 3 ) for driving and decelerating the hybrid vehicle ( 1 ), - a battery ( 4 ), - an internal combustion engine generator unit ( 6 ) as a range extender to charge the battery ( 4 ) and / or for generating electrical energy for the at least one electric machine ( 3 ), characterized in that a method according to one or more of the preceding claims is executable. Hybrid drive device according to claim 14, characterized in that the internal combustion engine ( 7 ) of the internal combustion engine-generator unit ( 6 ) no mechanical connection to the wheels ( 14 ) of the hybrid vehicle ( 1 ) having.

Images